.board-wrapper{position:relative;padding-left:20px;padding-bottom:20px}.chess-board{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:min(85vw,480px);height:min(85vw,480px);border-radius:4px;overflow:hidden;box-shadow:0 0 30px #00000080,0 0 60px #4ade801a}.cell{display:flex;align-items:center;justify-content:center;font-size:min(8vw,48px);line-height:1;aspect-ratio:1;cursor:pointer;position:relative;transition:background-color .15s;user-select:none;-webkit-user-select:none;-webkit-tap-highlight-color:transparent}.cell.light{background-color:#f0d9b5}.cell.dark{background-color:#b58863}.cell.white-piece{color:#fff;text-shadow:0 1px 3px rgba(0,0,0,.5)}.cell.black-piece{color:#1a1a2e;text-shadow:0 0 2px rgba(255,255,255,.2)}.cell.selected{background-color:#7fa5d0!important;box-shadow:inset 0 0 0 2px #5b8cc4}.cell.legal-move:after{content:"";position:absolute;width:28%;height:28%;background:#0003;border-radius:50%}.cell.legal-capture{background-image:radial-gradient(transparent 55%,#00000040 55%)}.cell.last-move{background-color:#ffff6473!important}.cell.last-move.light{background-color:#f5f682!important}.cell.last-move.dark{background-color:#baca44!important}.cell.check{background:radial-gradient(ellipse at center,rgba(255,0,0,.6) 0%,rgba(255,0,0,.3) 40%,transparent 70%)!important}.cell:hover:not(.selected){filter:brightness(1.1)}.row-labels{position:absolute;left:0;top:0;height:min(85vw,480px);display:flex;flex-direction:column;width:18px}.row-labels span{flex:1;display:flex;align-items:center;justify-content:center;font-size:11px;color:#94a3b8;font-weight:500}.col-labels{position:absolute;bottom:0;left:20px;width:min(85vw,480px);display:flex;height:18px}.col-labels span{flex:1;display:flex;align-items:center;justify-content:center;font-size:11px;color:#94a3b8;font-weight:500}.captured-bar{min-height:28px;flex-wrap:wrap}.captured-piece{font-size:18px;line-height:1;opacity:.8}.move-list{scrollbar-width:thin;scrollbar-color:#475569 transparent}.move-list::-webkit-scrollbar{width:4px}.move-list::-webkit-scrollbar-thumb{background:#475569;border-radius:2px}.move-row{display:flex;gap:4px;padding:2px 4px;border-radius:4px}.move-row:hover{background:#ffffff0d}.move-num{color:#64748b;min-width:24px}.move-white{color:#e2e8f0;min-width:50px}.move-black{color:#94a3b8;min-width:50px}.mode-btn,.diff-btn{color:#94a3b8}.mode-btn.active,.diff-btn.active{background:#22c55e;color:#fff}.mode-btn:not(.active):hover,.diff-btn:not(.active):hover{background:#ffffff1a}.promo-btn{width:60px;height:60px;font-size:40px;background:#334155;border-radius:12px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;border:2px solid transparent}.promo-btn:hover{background:#475569;border-color:#22c55e;transform:scale(1.1)}.modal-content{animation:modalIn .3s ease-out}@keyframes modalIn{0%{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}.panel{position:fixed;inset:0;z-index:40;transition:opacity .3s}.panel-hidden{pointer-events:none;opacity:0}.panel-overlay{position:absolute;inset:0;background:#0009}.panel-content{position:absolute;right:0;top:0;bottom:0;width:min(320px,85vw);background:#1e293b;padding:24px;overflow-y:auto;box-shadow:-4px 0 24px #0000004d}.panel-close{font-size:28px;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:8px;color:#94a3b8;transition:all .2s}.panel-close:hover{background:#334155;color:#fff}.stat-card{background:#334155;padding:16px;border-radius:12px;text-align:center}.stat-value{font-size:1.75rem;font-weight:700;font-family:monospace}.stat-label{font-size:.75rem;color:#94a3b8;margin-top:4px}@media(max-width:480px){.chess-board{width:min(92vw,400px);height:min(92vw,400px)}.col-labels{width:min(92vw,400px)}.row-labels{height:min(92vw,400px)}.cell{font-size:min(10vw,42px)}}